JSON Wallet workspace
Format, validate and repair JSON in your browser
Inspect API responses in text, tree or table view, compare changes and keep multiple documents open without uploading them.
A complete JSON toolkit that runs entirely in your browser
JSON Wallet is a free online JSON editor and formatter built for developers who work with JSON every day — debugging API responses, editing configuration files, inspecting log output, or cleaning up data exports. Everything happens locally in your browser: paste your JSON, work with it, and copy the result. Nothing is ever uploaded to a server, so even sensitive payloads stay on your machine.
A repeatable workflow for debugging API payloads
The two-panel workspace is designed around a real debugging loop rather than a single “beautify” button. Paste the response you received on the left, keep the expected or previous response on the right, and move between text and structural views without losing either copy.
- Validate first. Confirm that the payload parses and use the reported line and column to find the first syntax error.
- Repair deliberately. Review each proposed correction—such as a trailing comma or an unquoted key—before applying it.
- Compare values and structure. Check both changed lines and added or removed key paths, depending on what the API contract requires.
- Inspect the expensive fields. Use the size analyzer to identify the properties responsible for most of the payload.
Select Load an API example at the top of this section to walk through that workflow without using your own data, or read exactly how each operation is implemented in How JSON Wallet works.
What you can do with JSON Wallet
Format and beautify. Turn a single minified line into clean, indented, readable JSON automatically — or minify it back to one compact line when you need to ship it. See the step-by-step walkthrough in our guide on how to format and validate JSON.
Validate as you type. A live Valid / Invalid badge tells you instantly whether your JSON is well-formed, and when it is not, it points to the exact line and column of the first error so you are not hunting blind. If a message is unfamiliar, our reference on common JSON errors and how to fix them explains every one.
Explore with tree and table views. Large, deeply nested documents are hard to read as raw text. Switch to tree view to expand and collapse objects and arrays interactively, or table view to scan arrays of records like a spreadsheet and find the one field you care about.
Compare and diff. Paste two JSON documents side by side and highlight every addition, deletion and change between them — perfect for spotting what changed between two API responses or two versions of a config file.
Repair broken JSON. Trailing commas, single quotes, unquoted keys and unescaped characters are fixed automatically with one click, so you can recover data that would otherwise fail to parse.
Transform without leaving the page. Stringify and unstringify, escape and unescape, Base64 encode and decode, URL encode and decode, and strip HTML — all the fiddly conversions that come up when you move JSON between databases, logs, query strings and source code. Our guide on escaping and stringifying JSON explains when to reach for each.
Analyze size. The size analyzer breaks a document down property by property so you can see exactly what is making a payload heavy — invaluable before trimming a response or debugging a slow API.
Privacy by design — your data never leaves your device
Most online JSON tools send your data to a server to process it. JSON Wallet does not. The entire editor runs as client-side code in your browser, which means API responses containing tokens, internal configuration, and customer records are safe to paste here. You can read exactly how we handle data, cookies and analytics in our Privacy Policy.
Who JSON Wallet is for
Backend and frontend engineers use it to inspect and reshape API payloads. DevOps and platform engineers use it to validate configuration before a deploy. QA engineers diff responses to confirm a fix. Data analysts clean up exports before loading them. Students and people new to the format use it alongside our guides to learn how JSON works. If you touch JSON, it is built for you — no signup, no install, no cost.
Learn more about JSON
New to the format or want to go deeper? Our free, in-depth guides cover the essentials and the edge cases: